Plug-cutter



(No Model.) ,E. C. HEYDENREICH.

PLUG CUTTER.

No. 475,560. Patented May24, 1892.

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ERNST O. HEYDENREIOH, OF MOUNT CLEMENS, MICHIGAN.

PLUG-CUTTER.

SPECIFICATION forming part of Letters Patent No. 475,560, dated May 24, 1892.

Application filed December 28, 1891. gerial No. 416,356. No model.)

To all whom it may concern Be it known that I, ERNST C. HEYDENREICH, a citizen of the United States, residing at Mount Clemens, in the county of Macomb and Stateof Michigan, have invented certain new and useful Improvements in Plug-Gutters, of which the following is a specification, reference being bad therein to the accompanying drawings.

This invention relates to new and useful improvements in plug-cutters; and it consists in the peculiar construction of a tool designed to cut an annular recess in wood or other material to form a plug for usingin filling countersinks, &c., the tool having a suitable central aperture to allow the plug to pass therein as the tool enters the material.

The invention further consists in the peculiar construction of the means for beveling the upper edge of the plug, whereby it may be more readily inserted in the aperture in which it is to be used, all as more fully hereinafter described.

In the drawings, Figure l is a perspective View of my improved tool. Fig. 2 is a side elevation thereof. Fig. 3 is avertical central section on line ocaoin Fig. 2. Fig. tis a crosssection through the cylindrical cutting-head. Fig. 5 is an elevation of afinished plug. Fig. 6 is an enlarged diagram of the beveling cutter and plug.

A is the shank, having the usual squared portion at its end adapted to fit an ordinary brace. Depending from the lower end of the shankA is asemi-cylindrical portion 13, which at its lower end carries the cylindrical cutting-head O. The head 0 is provided at its lower inner edge with a circular knife D, which cuts the wood in advance of the teeth E, formed at the lower end of the spirally-arranged ribs F on the outside of the head, grooves G being formed between these ribs. Each tooth has an inclined cutting-edge -H, extending upward and outward from the outer face of the knife D, as plainly shown in Fig. 3. It is evident if this tool is put in a brace and rotated against the block of wood that the knife D and teeth E will cut an annular recess in the wood forming within it a plug, such as I, which will pass through the central aperture J within the head, the shavings and dust passing out through the grooves G to the top of the block. The knife D cuts the sides of the plug perfectly smooth and uniform in advance of the teeth E. As most plugs for this purpose are of a uniform length, and as it is desired usually to bevel off one end to more readily insert them in the countersink in which they are to be driven, to bevel off this end I employ acutter at, having a beveled edge inside of the head 0 of the tool and secured to a spring I), which is attached in any suitable manner to the outside thereofsuch as, for instance, by means of the screw 0, as shown in the drawings. As the tool gradually descends into the wood, the cutter a will chamfer off the upper end of the plug; but the spring I) is not of sufficient strength to interfere with the passage through the head of the finished plug without injuring the same. The plug may be passed through the head and be taken out through the open face K of the semicircular extension B, as plainly shown in the drawings.

To disengage the chamfering-tool from the work after it has cut the proper bevel upon the plug, I form the chamfering-cutter with a shoulder d, projecting into the path of the body of the plug and having an inclined face acting to gradually force the cutter back, disengaging the knife from the plug and allowing the work to pass through the head of the tool.

That I claim as myinvention is' '1. In a plug-cutter, the combination, with a shank, of a cylindrical cutting-head on the lower end thereof having an unbroken knifeedge on its extreme lower end, a series of-inclined ribs on the outer face of the cylindrical portion having inclined cutting-teeth on their lower ends and formed with intervening spaces, the said ribs extending from a point adjacent but beyond the cutting-edge to a point at or near the upper end of the cylindrical portion, and an inclined chamferingknife yieldingly supported in a recess in the cutting-head, substantially as described.

2. In a plug-cutter, the combination, with a hollow cutting-head having a recess therein, of a yielding chamfering-knife located within the head to one side of the center thereof, and means on the knife for forcing the same back into the recess upon the continued movement of the plug in the head, substantially as described.

3. In a plug-cutter, the combination, with a cylindrical cutting-head having an aperture in its side, of a spring secured on the outer face of the head, a cutter on the lower end of the spring projecting through the aperture and into the head beyond the inner walls thereof, and a series of inclined ribs in the outer face of the head having cuttingteeth on their lower ends, substantially as described.

4. In a plug-cutter, the combination, with the shank A, the cylindrical extension B,the cylindrical head 0 at the lower end thereof, and the spirally-arranged ribs F upon the outside of said head, having grooves between the same, of the teeth E, formed at the lower end of said ribs, having the inclined cutting-edges H, the annular knife D, formed at the lower inner edge of said head, and the beveled spring-supported cutter a, within said head, the parts arranged and operated substantially as and for the purpose described.

5. In a plug-cutter, the combination of the cylindrical cutting-head and a charnferingcutter in the head, consisting of a yieldinglysupported cutter arranged to one side of the center and extending inwardly and having an engaging edge to chamfer the edge of the plug and to cause it to recede when the plug is advanced into the cutting-head, substantially as described.

In testimony whereof I atfix my signature in presence of two witnesses.

ERNST C. HEYDENREIOH. Witnesses:

JAMES WHITTEMORE, M. B. ODoeHERTY. 

